Quantum Numbers and electron configuration.pptx

chemistry

1. Quantum Numbers Electron Configuration and Quantum Numbers Rafa Muñoa Lizardi Institutua Zarautz Conceptual Questions - INDEX Atomic Model - PT DIARY

2. Exercise The atomic number of an element is Z = 34. a) Give its electron configuration (standard notation) b) Give its condensed electron configuration c) Give the partial orbital diagram of valence electrons and assign their quantum numbers Rafa Muñoa Lizardi Institutua Zarautz

3. Flowchart atomic number Z = 34 standard electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 Moeller diagram Rafa Muñoa Lizardi Institutua Zarautz The atomic number of an element is Z = 34. a) Give its electron configuration (standard notation) b) Give its condensed electron configuration c) Give the partial orbital diagram of valence electrons and assign their quantum numbers condensed electron configuration [Ar] 4s 2 3d 10 4p 4 1s 2 2s 2 2p 6 3s 2 3p 6 = [Ar] Assignation of quantum numbers

4. Main Ideas Given the atomic number, electron configuration can be known, according to Moeller’s diagram. Assignation of quantum numbers: n … electron level l … sublevel: l=0 → “s”; sublevel: l=1 → “p”; sublevel: l=2 → “d” … m l … -l, … 0 …, l. Our criterium: starting from negative values to positive s … +½, -½ . Our criterium: first electron, +½ NOTE. ml and s require some criteria because energies are equivalent . We follow same criteria that that from textbook: “Chemistry. The Molecular Nature of Matter and Change”. Silberberg. Rafa Muñoa Lizardi Institutua Zarautz The atomic number of an element is Z = 34. a) Give its electron configuration (standard notation) b) Give its condensed electron configuration c) Give the partial orbital diagram of valence electrons and assign their quantum numbers

5. Sections A, B - Solutions To determine the electron configuration, we can follow the Moeller diagram . Given that sequencing, the electron configuration will be: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 [Ar] 4s 2 3d 10 4p 4 Rafa Muñoa Lizardi Institutua Zarautz The atomic number of an element is Z = 34. a) Give its electron configuration (standard notation) b) Give its condensed electron configuration c) Give the partial orbital diagram of valence electrons and assign their quantum numbers

6. Section C - Solution Rafa Muñoa Lizardi Institutua Zarautz The atomic number of an element is Z = 34. a) Give its electron configuration (standard notation) b) Give its condensed electron configuration c) Give the partial orbital diagram of valence electrons and assign their quantum numbers 4s (4,0,0) Name of the orbital and their three quantum numbers (n, l, m l ) 4p (4,1,-1) 4p (4,1,0) 4p (4,1,1) ↿ ↿ ↿ ↿ ⇂ ⇂ (4,0,0, +½ ) (4,0,0, - ½ ) (4,1,-1, +½ ) (4,1,-1, - ½ ) (4,1,0, +½ ) (4,1,1, +½ )